You'll notice that in the Modes lines there are resolutions. The listed resolutions are the ones the system is going to try. Add "1024x768" to the every one of the Modes lines. So it should look something like this

Make sure you add "1024x768" before the other resolution modes (from left to right).Double check there aren't any typosSave (Hit Ctrl + s)Save your work, next one is gonna restart your X server and that means shutting down all apps.Hit Ctrl + Alt + Backspace.

And then you should have your resolution set to 1024x768.

If by any chance you already have "1024x768" in the Modes lines, you will prolly need to adjust the proper refresh rates for you. In this case post your /etc/X11/xorg.conf here and we will continue.

In your case X will try to drive it to 75 Hz if it can. Assuming your display is an LCD, you should be fine using 60 Hz. Try changing those numbers to 50-60.

After each change, remember to save the file, and restart X (or your computer). When troubleshooting X I always boot to TUI and use "mcedit /etc/X11/xorg.conf" for edits, then "startx" to test display.